But ten heads without wit, I wene as good none..

Single Headed Redundancy

All animal mammal life, including human life has a great deal of symmetry and therefore headwise redundancy of sensory input.  Yes we only have one mouth, but we do have two eyes we have two ears and we have two nostrils... also apparently two brains in one as well.  So apparently Apollo had a redundant twin sister, Artemis.  Diversity in power, the power of two gods being better than one, or even take one if not the other.

"Some heades haue taken two headis better then one: But ten heads without wit, I wene as good none." - 16century Proverb.

 Artemis : flickr photo attributed to Efthimiadis.

In this post we can look at the overall aspect of redundancy where we have redundant measurements providing signals to redundant local real-time processors.

Last invensysscada blog post if you recall, discussed configured processing rather than programmatic processing.  In this post I hope to show how those same intrinsic data functions can be used in real-time to resolve the choice of measurement based on reach-ability and a configured priority.